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Interfacial Phenomena and Heat Transfer

Publicou 4 edições por ano

ISSN Imprimir: 2169-2785

ISSN On-line: 2167-857X

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DROPLET DYNAMICS AFTER IMPACTING ON HYDROPHILIC POWDER BEDS COMPOSED OF UNIFORM AND NON-UNIFORM SIZE PARTICLES

Volume 8, Edição 1, 2020, pp. 11-24
DOI: 10.1615/InterfacPhenomHeatTransfer.2020033426
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RESUMO

An experimental investigation is carried out to study the dynamics of a water droplet after its impact on two types of hydrophilic Cu powder beds (with the contact angle of 64° ± 10°), composed of uniform and non-uniform size particles, respectively. It is found that a droplet can infiltrate into a hydrophilic Cu powder bed composed of non-uniform size particles, and its penetration time is independent of the Weber (We) number. A droplet cannot infiltrate into a hydrophilic Cu powder bed composed of uniform size particles. Instead, the droplet bounces from the powder bed of uniform size particles (owing to the non-stick particle-coated surface) and forms a liquid marble. Maximum spread factors εmax on Cu powder beds are found to be smaller than that on a Cu substrate. Based on experimental data, the maximum spread factor on uniform and non-uniform hydrophilic powder beds can be scaled as εmax ~ We1/10 for 1 < We < 10 and as εmax ~ We1/5 for 10 < We < 40, respectively. It is also found that a hydrophilic powder bed, composed of small uniform size Cu particles (with an average diameter of 2.3 μm), behaves almost like a "super−hydrophobic" substrate, where the droplet can jump repeatedly after its impact on the powder bed. The droplet contact time after impacting on this powder bed is equal to the first-order oscillation period of the droplet.

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CITADO POR
  1. Tkachenko Pavel P., Islamova Anastasya G., Shlegel Nikita E., Strizhak Pavel A., EFFECT OF GAS PRESSURE AND TEMPERATURE ON THE REGIMES OF LIQUID DROPLET COLLISIONS , Interfacial Phenomena and Heat Transfer, 10, 1, 2022. Crossref

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